WO2022138703A1

WO2022138703A1 - Gas-generating agent, adhesive composition, and adhesive sheet

Info

Publication number: WO2022138703A1
Application number: PCT/JP2021/047514
Authority: WO
Inventors: 陽平伊藤; 教弘小倉
Original assignee: 大日本印刷株式会社
Priority date: 2020-12-25
Filing date: 2021-12-22
Publication date: 2022-06-30
Also published as: TW202235565A; KR102783841B1; JPWO2022138703A1; KR20230122603A; US20240141213A1; CN116615415A

Abstract

Provided is a gas-generating agent that generates a gas through the radiation of light. The gas-generating agent comprises: a gas-generating moiety having a specific structure; and a fluorinated aliphatic hydrocarbon group, which may contain an ether bond (-O-) in the carbon chain and for which the number of carbon atoms to which a fluorine atom is directly bonded is 2 to 8, or an organopolysiloxane group. The gas-generating agent also has a maximum value, for a molar extinction coefficient, of 7000 or higher at a wavelength of 240-450 nm.

Description

Gas generators, adhesive compositions, and adhesive sheets

The present disclosure relates to a gas generator, a pressure-sensitive adhesive composition containing the gas-generating agent, and a pressure-sensitive adhesive sheet.

The pressure-sensitive adhesive composition containing a pressure-sensitive adhesive component is widely used as a binder agent such as a pressure-sensitive adhesive, a sealing agent, a paint, and a coating agent, and a pressure-sensitive adhesive material such as an pressure-sensitive adhesive tape or a pressure-sensitive adhesive sheet. The performance required for these pressure-sensitive adhesive compositions varies depending on the application, but depending on the application, it may be required to exhibit adhesiveness only for a required period of time, but to be easily peeled off thereafter.

For example, in a process of manufacturing a semiconductor chip, in a process of polishing a thick film wafer cut out from a high-purity silicon single crystal or the like to a predetermined thickness to obtain a thin film wafer, the thick film wafer is adhered to an adhesive sheet. It has been proposed that the work be carried out efficiently by reinforcing it. Further, when dicing a thin film wafer ground to a predetermined thickness into individual semiconductor chips, an adhesive sheet called a dicing tape is used as a temporary fixing support. Further, in the manufacturing process of the laminated ceramic capacitor (MLCC), the adhesive sheet is temporarily used when the sheet of the dielectric paste on which the electrodes are printed is laminated and then pressed to be pressure-bonded and integrated into chips. Used as a fixed support. Further, in the flexible printed wiring board manufacturing process, the adhesive sheet is used as a process support for temporary fixing. Further, in the manufacturing process of the flexible printed wiring board and the flexible organic EL display, the above-mentioned is aimed at preventing the substrate from being scratched or contaminated by chemicals, and deterioration of the substrate due to chemicals or heating used in the manufacturing process. A protective sheet that protects the surface of the substrate may be used, and the adhesive sheet is used as the temporary protective sheet.

While firmly adhering to the process adhesive material used in such a manufacturing process during the process, it can be peeled off without damaging the obtained thin film wafer, semiconductor chip, etc. after the process is completed (hereinafter, "high"). Also called "easy adhesion peeling") is required.

As an adhesive material for high adhesiveness and easy peeling, Patent Document 1 discloses an adhesive tape using a photocurable adhesive which is cured by irradiation with light such as ultraviolet rays to reduce the adhesive strength. .. It is said that such an adhesive tape can be easily peeled off by irradiating it with ultraviolet rays or the like while adhering it during the processing process. However, with such an adhesive tape, the decrease in adhesive strength after irradiation with ultraviolet rays or the like is insufficient, and it is difficult to peel off the thin film wafer, the semiconductor chip, or the like without damaging them.

Further, Patent Document 2 discloses an adhesive tape having an adhesive layer containing a gas generating agent that generates a gas by stimulation, such as an azo compound. When the adhesive tape is stimulated, the gas generated from the gas generating agent is released to the interface between the surface of the tape and the adherend, and the pressure causes at least a part of the adherend to be peeled off to form a thin film wafer. It is said that it can be peeled off without damaging the semiconductor chip or the like and without leaving adhesive residue.

Further, in Patent Document 3, as an adhesive composition which has high adhesiveness, can be easily peeled off, and has excellent heat resistance, a gas is generated by irradiation with light, and tetrazole having high heat resistance. Adhesive compositions using compounds have been proposed.
However, even if the above-mentioned azo compound or tetrazole compound is used, there are problems that the peeling power is not sufficiently reduced and that the addition amount must be increased in order to sufficiently reduce the peeling power.

Japanese Unexamined Patent Publication No. 5-32946 Japanese Patent Application Laid-Open No. 2003-231872 International Publication No. 2011/118506

Due to the refinement and complexity of various electronic members, the process is such that the adherend itself and the surface of the adherend are easily destroyed due to the thinning of the adherend itself, the integration of functions, and the miniaturization. While the inside is firmly adhered, it is required to be easily peeled off with less load on the adherend after the process is completed.
However, there is a trade-off relationship between the improvement of the adhesive strength and the improvement of the easy peeling property, and the conventional adhesive material for the purpose of high adhesive and easy peeling has not yet been sufficiently easy to peel off.

The present disclosure has been made in view of the above circumstances, and is a gas generator that generates a gas by light irradiation, which can improve the effect of imparting peelability to the surface, and when the gas generator is used, when used. A pressure-sensitive adhesive composition that has sufficient adhesive strength and is capable of forming an adhesive layer that is easily peeled off from an adherend when peeled off. It is an object of the present invention to provide an adhesive sheet having excellent peelability from an adherend.

One embodiment of the present disclosure is represented by at least one of the following general formulas (1) and (2), the maximum value of the molar extinction coefficient at a wavelength of 240 to 450 nm is 7,000 or more, and gas is generated by light irradiation. A gas generating agent is provided.

(In the general formulas (1) and (2),
A independently represents a gas generating part represented by the following general formulas (A-1), (A-2) or (A-3).
L each independently represents a direct bond or a divalent linking group.
^Q1 has 2 to 8 carbon atoms to which a fluorine atom is directly bonded, may contain an ether bond (—O—) in the carbon chain, and may have a substituent. Represents a fluorinated aliphatic hydrocarbon group or a monovalent organopolysiloxane group.
^Q2 has a divalent fluorinated aliphatic hydrocarbon group having 2 to 8 carbon atoms to which a fluorine atom is directly bonded and may contain an ether bond (—O—) in the carbon chain, or a divalent fluorinated aliphatic hydrocarbon group. Represents a divalent organopolysiloxane group. )

(In the general formulas (A-1), (A-2) and (A-3), R ¹ is an aromatic group having 3 to 20 carbon atoms which may have a substituent, and R ² is independent of each other. In addition, a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent, and R3 ^are each independently or a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent. , Cyan group, -COOR ⁵ , or -CONR ⁶ R ⁷ , R ⁴ may have a substituent, a hydrocarbon group having 1 to 20 carbon atoms, a cyano group, -COOR ⁵ , -CONR ⁶ R ⁷ , Or the above-LQ ¹ , R ⁵ and R ⁷ each independently represent a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent, and R ⁶ is a hydrogen atom or a hydrogen atom or. Represents a hydrocarbon group having 1 to 5 carbon atoms.)

In the general formulas (1) and (2) of the gas generating agent of the present disclosure, ^Q1 is a monovalent fluorination of any one represented by the following (Rf-1) to (Rf-5). It represents an aliphatic hydrocarbon group or a monovalent organopolysiloxane group represented by the following (Si-1), and ^Q2 is a divalent fluorinated aliphatic hydrocarbon represented by the following (Rf-6). It may represent a hydrogen group or a divalent organopolysiloxane group represented by the following (Si-2).

(In the formula (Rf-1), the formula (Rf-2) and the formula (Rf-3), n independently represents an integer of 2 to 8, and in the formula (Rf-4), n'is 4 to 4 to. Represents an integer of 10, and in (Rf-5), n is an integer of 0 to 8, n "is an integer of 0 to 4, m is an integer of 0 to 8, but n + n" × m is an integer of 2 to 8. Representing, J ¹ represents a hydrogen atom, a fluorine atom, a hydroxyl group, an amino group, a carboxy group, or a (meth) acryloyloxy group, and in (Rf-6), n is an integer of 1 to 8, and n "is 0 to 0. An integer of 7, m is an integer of 0 to 7, where n + n ”× m is an integer of 2 to 8).

(In the formulas (Si-1) and (Si-2), R ¹¹ independently has a monovalent hydrocarbon group having 1 to 20 carbon atoms, which may have a substituent, a hydrogen atom, a hydroxyl group, and the like. Represents an alkoxy group having 1 to 20 carbon atoms or a group represented by the following general formula (Si-3), and J2 is a monovalent hydrocarbon having 1 to ²⁰ carbon atoms which may have a substituent. It represents a group, a hydrogen atom, a hydroxyl group, an alkoxy group having 1 to 20 carbon atoms, an amino group, a carboxy group, or a (meth) acryloyloxy group. A independently represents a number of 1 to 100.)

(In the formula (Si-3), R ¹² has a monovalent hydrocarbon group having 1 to 20 carbon atoms, a hydrogen atom, a hydroxyl group, or 1 to 20 carbon atoms, each of which may independently have a substituent. Represents an alkoxy group of, and b represents a number from 0 to 100.)

In the general formulas (1) and (2) in the gas generating agent of the present disclosure, L is directly bonded or directly bonded to each other, or -SCH ₂ CH ₂ COO-, -SCH ₂ CH (CH ₃ ) COO, respectively. -, -SCH ₂ CH (OH) CH _2- , -OCH ₂ CH (OH) CH _2- , -SCH (CH ₃ ) O-, -OCH (CH ₃ ) O-, -COO-, -CONH-, One or more selected from the group consisting of -COS-, -SO ₂ NH-, or -O- and -S- may be contained, and the hydroxyl group may be substituted with 1 to 22 carbon atoms. It may represent the hydrocarbon group of the above, or a combination thereof.

Another embodiment of the present disclosure provides a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive component and the gas generating agent of one embodiment of the present disclosure.

Another embodiment of the present disclosure comprises a pressure-sensitive adhesive layer and a substrate or mold release sheet on one surface of the pressure-sensitive adhesive layer.
The pressure-sensitive adhesive layer is a pressure-sensitive adhesive composition or a cured product thereof containing a pressure-sensitive adhesive component and the gas generating agent of one embodiment of the present disclosure, and the pressure-sensitive adhesive layer is reduced from the initial pressure-sensitive adhesive force by light irradiation. Provided is an adhesive sheet having the characteristics of

The pressure-sensitive adhesive composition of the present disclosure and the pressure-sensitive adhesive composition in the pressure-sensitive adhesive sheet may contain a photocurable component and a photoinitiator.

The pressure-sensitive adhesive composition of the present disclosure and the pressure-sensitive adhesive composition in the pressure-sensitive adhesive sheet may contain a heat-crosslinking agent.

The pressure-sensitive adhesive sheet of the present disclosure may further include a release sheet on the surface of the pressure-sensitive adhesive layer opposite to the base material or the release sheet side.

According to the embodiment of the present disclosure, a gas generator that generates a gas by light irradiation, which can improve the effect of imparting peelability to the surface, and the gas generator, which has sufficient adhesive strength at the time of use. However, when peeling off, a pressure-sensitive adhesive composition capable of forming an adhesive layer having excellent peelability from the adherend, and the pressure-sensitive adhesive composition is used, while having sufficient adhesive strength at the time of use, it is adhered. It is possible to provide an adhesive sheet having excellent peelability from the body.

It is a schematic cross-sectional view which shows an example of the pressure-sensitive adhesive sheet in this disclosure. It is a schematic cross-sectional view which shows the other example of the pressure-sensitive adhesive sheet in this disclosure.

Hereinafter, embodiments and examples of the present disclosure will be described with reference to the drawings and the like. However, the present disclosure can be carried out in many different modes, and is not construed as being limited to the description contents of the embodiments and examples illustrated below. In addition, in order to clarify the explanation, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the actual embodiment, but this is just an example, and the interpretation of the present disclosure is used. It is not limited. Further, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures may be designated by the same reference numerals, and detailed description thereof may be omitted as appropriate. Further, for convenience of explanation, the phrase "upper" or "lower" may be used for explanation, but the vertical direction may be reversed.
"In the present specification, when a configuration such as a member or a region is" above (or below) "an other configuration such as another member or another region, unless otherwise specified. , This includes not only the case of being directly above (or directly below) the other configuration, but also the case of being above (or below) the other configuration, i.e., another in between above (or below) the other configuration. Including the case where components are included.

In the present disclosure, (meth) acrylic represents each of acrylic or methacrylic, and (meth) acrylate represents each of acrylate or methacrylate.
Further, in the present specification, the "sheet" also includes a member called a "film". The "film" also includes a member called a "sheet". Further, the "sheet surface (film surface)" is the plane direction of the target sheet-like member (film-like member) when the target sheet-like member (film-like member) is viewed as a whole and from a broad perspective. Refers to the matching plane.
In the present disclosure, the "light" includes light including ultraviolet rays.
Hereinafter, the gas generator, the pressure-sensitive adhesive composition, and the pressure-sensitive adhesive sheet of the present disclosure will be described in detail in order.

A. Gas generator The gas generator of one embodiment of the present disclosure is represented by at least one of the following general formulas (1) and (2), and has a maximum molar extinction coefficient of 7,000 or more at a wavelength of 240 to 450 nm. It is a gas generating agent that generates gas by light irradiation.

(In the general formulas (A-1), (A-2) and (A-3), R ¹ is an aromatic group having 3 to 20 carbon atoms which may have a substituent, and R ² is independent of each other. In addition, a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent and R3 independently have a hydrocarbon group having ¹ to 20 carbon atoms which may have a substituent. , Cyan group, -COOR ⁵ , or -CONR ⁶ R ⁷ , R ⁴ may have a substituent, a hydrocarbon group having 1 to 20 carbon atoms, a cyano group, -COOR ⁵ , -CONR ⁶ R ⁷ , Or the above-LQ ¹ , R ⁵ and R ⁷ each independently represent a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent, and R ⁶ is a hydrogen atom or a hydrogen atom or. Represents a hydrocarbon group having 1 to 5 carbon atoms.)

The gas generator of the present disclosure has the gas generating part having the specific structure and the specific fluorinated aliphatic hydrocarbon group or the specific organopolysiloxane group, and has a molar absorption coefficient at a wavelength of 240 to 450 nm. Is a gas generating agent having a maximum value of 7,000 or more and generating a gas by light irradiation, so that the effect of imparting peelability to the surface can be improved. The reason for this is not clear, but it is presumed as follows.
In the adhesive layer containing a gas generating agent for the purpose of high adhesion and easy peeling, the gas generated from the gas generating agent is applied to the surface of the adhesive layer, that is, the interface with the adherend by irradiating light after use. It is released and the pressure causes at least a portion of the adherend to peel off. By releasing the gas to the surface of the adhesive layer, the adhesive layer has a reduced contact area with the adherend and can be easily peeled off. In the conventional pressure-sensitive adhesive layer containing a gas-generating agent, the gas-generating agent is uniformly dispersed in the pressure-sensitive adhesive layer. It is difficult for the gas to be released to the surface of the adhesive layer, and the amount of gas generated on the surface of the adhesive layer is insufficient only with the gas generated from the gas generating agent existing near the surface of the adhesive layer. The easy peelability was insufficient. If the content of the gas generating agent in the adhesive layer is increased in order to increase the amount of gas generated on the surface of the adhesive layer, the adhesive strength of the adhesive layer may be lowered or the adhesive layer may become cloudy. There was a limit to the improvement of peeling power by adding a gas generating agent.
On the other hand, in the gas generating agent of the present disclosure, the specific fluorinated aliphatic hydrocarbon group or the specific organopolysiloxane group is introduced into the gas generating portion having the specific structure. , Easy to localize on the surface. In the pressure-sensitive adhesive layer containing the gas generating agent of the present disclosure, the gas generating agent tends to be localized on the surface of the pressure-sensitive adhesive layer. Therefore, when irradiated with light, the gas-generating agent localized on the surface of the pressure-sensitive adhesive layer releases gas. It is generated and the gas is easily released to the surface of the adhesive layer. In the pressure-sensitive adhesive layer containing the gas generating agent of the present disclosure, the amount of gas generated on the surface of the pressure-sensitive adhesive layer is efficiently increased, so that the adhesive layer is excellent in easy peeling property from the adherend. Since the gas generating agent of the present disclosure is easily localized on the surface of the adhesive layer, the amount of gas generated on the surface of the adhesive layer can be efficiently increased without increasing the content of the gas generating agent. , It is possible to suppress a decrease in the adhesive strength of the adhesive layer and white turbidity. As described above, it is presumed that the gas generating agent of the present disclosure can improve the effect of imparting peelability to the surface.

The gas generating agent of the present disclosure can be decomposed by light irradiation to generate a gas. Since the gas generator of the present disclosure has a maximum molar extinction coefficient of 7,000 or more at a wavelength of 240 to 450 nm, it can efficiently absorb light containing ultraviolet rays, and can be efficiently irradiated with light containing ultraviolet rays. It can be decomposed to generate gas.
In the general formulas (1) and (2), A independently represents the gas generating portion represented by the general formula (A-1), (A-2) or (A-3).
In the gas generating portion represented by the general formula (A-1), the tetrazole ring is decomposed by light irradiation to generate nitrogen gas.
The gas generating part represented by the general formula (A-2) has a-(C = O)-(C = N ₂ ) -bond, a-(C = C = O) -bond and nitrogen by light irradiation. Decomposes into gas to generate nitrogen gas.
The gas generating portion represented by the general formula (A-3) is decomposed at the azo group portion by light irradiation to generate nitrogen gas.

In the general formula (A-1), as the aromatic group having 3 to 20 carbon atoms which may have a substituent in R ¹ , the compound satisfies the maximum value of the specific molar extinction coefficient. It may be selected as appropriate.
Examples of the aromatic group having 3 to 20 carbon atoms include an aromatic hydrocarbon group and an aromatic heterocyclic group.

Examples of the aromatic hydrocarbon group include an aromatic hydrocarbon group having 6 to 20 carbon atoms, and an aromatic hydrocarbon group having 6 to 12 carbon atoms is preferable, for example, a phenyl group, a biphenyl group, a naphthyl group, and an anthryl group. , Phenantril group, fluorenyl group, naphthylphenyl group, pyrenyl group and the like.
Examples of the aromatic heterocyclic group include an aromatic heterocyclic group having 3 to 20 carbon atoms containing at least one of a nitrogen atom, an oxygen atom and a sulfur atom, and an aromatic heterocyclic group having 3 to 10 carbon atoms. Preferably, for example, a pyrrolyl group, a frill group, a thienyl group, a pyrazolyl group, an imidazolyl group, an oxazolyl group, an isooxazolyl group, a thiazolyl group, an isothiazolyl group, a carbazole group and the like can be mentioned.
Examples of the substituent that the aromatic group may have include a halogen atom such as F, Cl and Br, an alkoxy group such as a nitro group, an alkyl group, an alkenyl group, an aralkyl group and a methoxy group, and a diphenylamino group. Examples thereof include an acyl group such as a tertiary amino group and a benzoyl group. The alkyl group, alkenyl group, and aralkyl group may be the same as the alkyl group having 1 to 20 carbon atoms, the alkenyl group having 2 to 20 carbon atoms, and the aralkyl group, which will be described later, but the alkyl group having 1 to 14 carbon atoms, It is preferably an alkenyl group having 2 to 14 carbon atoms and an aralkyl group having 7 to 14 carbon atoms. By appropriately selecting the substituent of the aromatic group, the absorption wavelength of light can be changed and the compatibility with other components can be improved. Examples of the substituent that changes the absorption wavelength of light toward the long wavelength side include an alkoxy group such as a methoxy group, a diarylamino group such as a diphenylamino group, and an acyl group such as a benzoyl group.

^R1 may be an aromatic hydrocarbon group having 6 to 14 carbon atoms which may have a substituent because the absorption wavelength region can be expanded and the wavelength can be lengthened. Among them, R1 has a substituent. It is preferably an aromatic hydrocarbon group having 6 to 12 carbon atoms, more preferably a phenyl group, a naphthyl group, or an anthryl group which may have a substituent, and irradiate light containing ultraviolet rays. In some cases, a naphthyl group is more preferable because the sensitivity is high and the gas generation efficiency is improved.

Examples of the hydrocarbon group having 1 to 20 carbon atoms which may have a substituent in ^R2 include an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aralkyl group, and an aryl group. And so on.
The alkyl group having 1 to 20 carbon atoms may be linear, branched or cyclic, and may be, for example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group or 2-. Examples thereof include ethylhexyl group, cyclopentyl group, cyclohexyl group, bornyl group, isobornyl group, dicyclopentanyl group, adamantyl group, lower alkyl group substituted adamantyl group and the like.
The alkenyl group having 2 to 20 carbon atoms may be linear, branched or cyclic. Examples of such an alkenyl group include a vinyl group, an allyl group, a propenyl group and the like. The position of the double bond of the alkenyl group is not limited, but from the viewpoint of reactivity, it is preferable that the double bond is at the end of the alkenyl group.
The aryl group may be the same as the aromatic hydrocarbon group in R ¹ , but a phenyl group, a biphenyl group, a naphthyl group and the like are preferably used.
Examples of the aralkyl group include a benzyl group, a phenethyl group, a naphthylmethyl group, a biphenylmethyl group and the like. The carbon number of the aralkyl group is preferably 7 to 20, and more preferably 7 to 14.

Examples of the substituent that the hydrocarbon group may have include halogen atoms such as F, Cl and Br, a nitro group and the like.
The alkyl group may be used as the substituent of the aromatic ring such as the aryl group or the aralkyl group.
The preferable carbon number does not include the carbon number of the substituent.

^R2 is a hydrocarbon group having 1 to 6 carbon atoms which may have a hydrogen atom or a substituent in terms of solubility and reactivity of an organic solvent and a nitrogen content in one molecule. It is preferable that all three atoms are hydrogen atoms.

The hydrocarbon group having 1 to 20 carbon atoms which may have a substituent in R ³ , R ⁴ , R ⁵ and R ⁷ may have a substituent in R ² and has 1 to 20 carbon atoms. The same as 20 hydrocarbon groups can be mentioned.
The hydrocarbon group having 1 to 5 carbon atoms in R ⁶ corresponds to the hydrocarbon group having 1 to 5 carbon atoms among the hydrocarbon groups having 1 to 20 carbon atoms which may have the substituent in ^R2 . Something similar to what you do.
-L-Q ¹ in R ⁴ may be the same as described later.

The hydrocarbons R5 and ^R7 may have substituents having ¹ to 20 carbon atoms independently from the viewpoint of the solubility of the organic solvent and the nitrogen content in one molecule. It is preferably a group, and more preferably a hydrocarbon group having 1 to 10 carbon atoms.
From the viewpoint of the nitrogen content contained in one molecule, R ⁶ is preferably a hydrogen atom or a methyl group, and more preferably a hydrogen atom.

R ³ is a hydrocarbon group or a hydrocarbon group which may independently have a substituent having 1 to 10 carbon atoms, in terms of the solubility of an organic solvent and the content of nitrogen contained in one molecule. , A cyano group is preferable, a hydrocarbon group having 1 to 5 carbon atoms is more preferable, and a methyl group or an ethyl group may be used.

The ^R4 is a hydrocarbon group having 1 to 10 carbon atoms or the above-mentioned −L— from the viewpoint of solubility in an organic solvent and localization to the surface of the adhesive layer. Q ¹ is preferable, and —L—Q ¹ is more preferable.

In the general formulas (1) and (2), A can represent the gas generating part represented by the general formula (A-1) in terms of heat resistance and nitrogen content in one molecule. preferable.
The gas generating unit represented by the general formula (A-1) is exemplified below, but is not limited thereto.

On the other hand, in the general formulas (1) and (2), ^Q1 has 2 to 8 carbon atoms to which a fluorine atom is directly bonded, and contains an ether bond (—O—) in the carbon chain. It may also represent a monovalent fluorinated aliphatic hydrocarbon group or a monovalent organopolysiloxane group which may have a substituent, and ^Q2 is the number of carbon atoms to which the fluorine atom is directly bonded. It represents 2 to 8 and represents a divalent fluorinated aliphatic hydrocarbon group or a divalent organopolysiloxane group which may contain an ether bond (—O—) in the carbon chain.

Examples of the fluorinated aliphatic hydrocarbon group in ^Q1 and ^Q2 include a linear or branched saturated or unsaturated fluorinated aliphatic hydrocarbon group.
If the number of carbon atoms to which the fluorine atom is directly bonded is 2 to 8, the fluorinated aliphatic hydrocarbon group in ^Q1 and ^Q2 contains a carbon atom to which the fluorine atom is not directly bonded. It may be. For example, when the fluorinated aliphatic hydrocarbon group contains an alkynyl group, a carbon atom to which a fluorine atom is not directly bonded is included.

The fluorinated aliphatic hydrocarbon groups in ^Q1 and ^Q2 do not have to be all substituted with fluorine atoms in the carbon atom to which the fluorine atom is directly bonded, and some of them have hydrogen atoms or substituents. It may be included. The substituent may be, for example, a reactive group used when linking with a gas generating part, and may be a hydroxyl group, an amino group, a carboxy group, or a (meth) acryloyloxy group, a vinyl ether group, a phosphoric acid group, or the like. Examples include an epoxy group.

The fluorinated aliphatic hydrocarbon group in ^Q1 and ^Q2 preferably contains 4 or more fluorine atoms, and more preferably 6 or more, from the viewpoint of the effect of surface localization. The number of fluorine atoms in the fluorinated aliphatic hydrocarbon group may be 17 or less, and may be 16 or less.

As the fluorinated aliphatic hydrocarbon in ^Q1 and ^Q2 , Q1 is ^one of the following (Rf-1) to (Rf-5) from the viewpoint of the effect of surface localization. A fluorinated aliphatic hydrocarbon group having a valence is mentioned, and ^Q2 is a divalent fluorinated aliphatic hydrocarbon group represented by the following (Rf-6).

(In the formula (Rf-1), the formula (Rf-2) and the formula (Rf-3), n independently represents an integer of 2 to 8, and in the formula (Rf-4), n'is 4 to 4 to. In (Rf-5), n represents an integer of 1 to 8, n "represents an integer of 0 to 7, m represents an integer of 0 to 7, and n + n" × m represents an integer of 2 to 8. , J ¹ represents a hydrogen atom, a fluorine atom, a hydroxyl group, an amino group, a carboxy group, or a (meth) acryloyloxy group, and in (Rf-6), n is an integer of 0 to 8, and n "is an integer of 0 to 4. , M is an integer of 0 to 8, where n + n ”× m is an integer of 2 to 8).

In the above equations (Rf-1), (Rf-2) and (Rf-3), n independently represents an integer of 2 to 8, but from the viewpoint of the effect of surface localization, n is among them. It preferably represents an integer of 4-8.
In the above (Rf-4), n'represents an integer of 4 to 10, but from the viewpoint of the effect of surface localization, n is preferably an integer of 5 to 10.
In the above (Rf-5), n is an integer of 1 to 8, n "is an integer of 0 to 7, m is an integer of 0 to 7, and n + n" × m is an integer of 2 to 8. From the viewpoint of the effect of localization, it is preferable that n represents an integer of 2 to 8, n "represents an integer of 1 to 7, m represents an integer of 1 to 7, and n + n" × m represents an integer of 3 to 8. It is preferable to represent it.
In the above (Rf-6), n is an integer of 0 to 8, n "is an integer of 0 to 4, m is an integer of 0 to 8, and n + n" xm is an integer of 2 to 8. From the viewpoint of the effect of localization, it is preferable that n represents an integer of 2 to 8, n "represents an integer of 1 to 7, m represents an integer of 1 to 7, and n + n" × m represents an integer of 3 to 8. It is preferable to represent it.

In the above (Rf-5), J ¹ represents a hydrogen atom, a fluorine atom, a hydroxyl group, an amino group, a carboxy group, or a (meth) acryloyloxy group. J ¹ is preferably a hydrogen atom or a fluorine atom, more preferably a fluorine atom, but may be a hydroxyl group, an amino group, a carboxy group, or a (meth) acryloyloxy group. When J ¹ has such a reactive group, it may be used, for example, for binding other components in the pressure-sensitive adhesive composition to a gas generating agent.
When the compound of the general formula (2) is prepared, the structure of the general formula (1) is obtained even when the gas generating part is not introduced at both ends and the gas generating part is introduced only at one end. However, it may have a reactive group such as a hydroxyl group, an amino group, a carboxy group, or a (meth) acryloyloxy group at the terminal.

Among them, Q ¹ is preferably any one monovalent fluorinated aliphatic hydrocarbon group represented by the above (Rf-1) or (Rf-5), and the above (Rf-1) or (Rf-1) or ( It is more preferable that it is any one monovalent fluorinated aliphatic hydrocarbon group represented by Rf-5), and any one monovalent fluorinated aliphatic hydrocarbon represented by the above (Rf-1). It is more preferably a hydrocarbon group.

On the other hand, the organopolysiloxane group in ^Q1 and ^Q2 has a siloxane bond- (O-Si) _a- (where a is the number of repetitions) in the main chain and a hydrocarbon group in at least a part of the side chain. Refers to a group containing.

Examples of the organopolysiloxane group in ^Q1 and ^Q2 include a ^monovalent organopolysiloxane group represented by the following (Si-1) in terms of the effect of surface localization, and ^Q2 . Is a divalent organopolysiloxane group represented by the following (Si-2).

As the monovalent hydrocarbon group having 1 to 20 carbon atoms which may have a substituent in R ¹¹ and R ¹² , the hydrocarbon having 1 to 20 carbon atoms which may have a substituent in R ² is mentioned. It may be the same as the hydrogen group. As the monovalent hydrocarbon group having 1 to 20 carbon atoms which may have a substituent in R ¹¹ and R ¹² , among them, the hydrocarbon group having 1 to 10 carbon atoms which may have a substituent may be present. Is preferable, and specifically, an alkyl group such as a methyl group, an ethyl group, a propyl group and a butyl group, a cycloalkyl group such as a cyclohexyl group, an aryl group such as a phenyl group and a trill group, and an aralkyl group such as a benzyl group and a phenethyl group. A hydroxypropyl group, a cyanoethyl group, a 1-chloropropyl group, 3,3, in which a part or all of the hydrogen atom bonded to the carbon atom of the group or these groups is substituted with a hydroxy group, a cyano group, a halogen atom, or the like. Examples thereof include a 3-trifluoropropyl group.
The alkoxy group having 1 to 20 carbon atoms in R ¹¹ and R ¹² is preferably an alkoxy group having 1 to 10 carbon atoms, and specific examples thereof include a methoxy group, an ethoxy group, a propoxy group and a butoxy group.
As R ¹¹ and R ¹² , from the viewpoint of solubility in an organic solvent, an alkyl group having 1 to 10 carbon atoms, an aryl group, or a group represented by the general formula (Si-3) is preferable, and the group has the same number of carbon atoms. It is more preferably 1 to 5 alkyl groups. The R ¹² is preferably an alkyl group or an aryl group having 1 to 10 carbon atoms, and more preferably an alkyl group having 1 to 5 carbon atoms.

J ² may have a substituent and is a monovalent hydrocarbon group having 1 to 20 carbon atoms, a hydrogen atom, a hydroxyl group, an alkoxy group having 1 to 20 carbon atoms, an amino group, a carboxy group, or (meth). Represents an acryloyloxy group. J ² is preferably a monovalent hydrocarbon group having 1 to 20 carbon atoms, a hydrogen atom, or an alkoxy group having 1 to 20 carbon atoms which may have a substituent, but a hydroxyl group, an amino group, and the like. It may be a carboxy group or a (meth) acryloyloxy group. When J ² has such a reactive group, it may be used, for example, for binding other components in the pressure-sensitive adhesive composition to a gas generating agent.
When the compound of the general formula (2) is prepared, the structure of the general formula (1) is obtained even when the gas generating part is not introduced at both ends and the gas generating part is introduced only at one end. However, it may have a reactive group such as a hydroxyl group, an amino group, a carboxy group, or a (meth) acryloyloxy group at the terminal.

In the general formulas (Si-1) and (Si-2), a represents a number from 1 to 100. Since a may have a distribution, it may be an average value. Among them, a preferably represents a number of 1 to 50, more preferably represents a number of 5 to 45, and further preferably represents a number of 10 to 40 in terms of the nitrogen content in one molecule.
Further, in the general formula (Si-3), b represents a number from 0 to 100. Since b can also have a distribution, it may be an average value. Among them, b preferably represents a number of 0 to 40, and more preferably represents a number of 0 to 30.

When used in the fields related to semiconductors and displays, Q1 has 2 to 8 carbon atoms to which fluorine atoms are directly bonded, and ether bonds (ether bonds in the carbon chain) ( ^Q1 ) because the possibility of contamination is low. It is preferably a monovalent fluorinated aliphatic hydrocarbon group which may contain —O—) and may have a substituent, and ^Q2 is the number of carbon atoms to which the fluorine atom is directly bonded. Is 2 to 8, and is preferably a divalent fluorinated aliphatic hydrocarbon group which may contain an ether bond (—O—) in the carbon chain.

On the other hand, in the general formulas (1) and (2), L independently represents a direct bond or a divalent linking group, respectively. In the general formulas (1) and (2), L represents a portion connecting the gas generating portion and the specific fluorinated aliphatic hydrocarbon group or the organopolysiloxane group, and the gas generating portion includes the specific portion. It is not particularly limited as long as it is a connecting portion to which a fluorinated aliphatic hydrocarbon group or an organopolysiloxane group can be bonded.
The direct bond means that L does not have an atom, that is, the carbon atom of A in the general formulas (1) and ( ² ) and the carbon atom or silicon atom of ^Q1 or Q2 are other. It means that they are bonded without interposing atoms.

The Ls in the general formulas (1) and (2) are independently, for example, directly bonded, or -SCH ₂ CH ₂ COO-, -SCH ₂ CH (CH ₃ ) COO-, -SCH ₂ CH ( OH) CH _2- , -OCH ₂ CH (OH) CH _2- , -SCH (CH ₃ ) O-, -OCH (CH ₃ ) O-, -COO-, -CONH-, -COS-, -SO ₂ A hydrocarbon group having 1 to 22 carbon atoms, which may contain one or more selected from the group consisting of NH- or -O- and -S-, and may have a hydroxyl group substituted, or a hydrocarbon group having 1 to 22 carbon atoms. These combinations can be mentioned. In L, the direction of the bond may be arbitrary. That is, when L is -SCH ₂ CH ₂ COO-, S is bonded to the carbon atom of A, O is bonded to the carbon atom or silicon atom of Q ¹ or Q ² , and S is the above. This includes the case where it is bonded to the carbon atom or silicon atom of ^Q1 or ^Q2 and O is bonded to the carbon atom of A.

Examples of the hydrocarbon group having 1 to 22 carbon atoms include a methylene group, an ethylene group, a propylene group (trimethylene group and a methylethylene group), a butylene group (tetramethylene group and a methylpropylene group), a pentamethylene group and a hexamethylene group. Examples thereof include an alkylene group such as a group, an octamethylene group and a cyclohexylene group, an arylene group such as a phenylene group, and a combination of two or more of these groups (alkylene arylene group).

Examples of the combination in L in the general formulas (1) and (2) include, for example.
(L1): -SCH ₂ CH ₂ _COO- (Cj H _2j )-,
(L2): -SCH ₂ CH ₂ COO- (C _j H _2j ) -O- (C _k H _2k )-,
(L3): -SCH ₂ CH ₂ COO- (C _j H _2j ) -NHCO- (C _k H _2k )-,
(L4): -SCH ₂ CH ₂ CO-OCH ₂ CH (OH) CH ₂ O- ( _Cj H _2j )-,
(L5): -SCH ₂ CH ₂ CO-OCH ₂ CH (OH)-( _Cj H _2j )-,
(L6): -SCH ₂ CH ₂ COO- (C _j H _2j ) -NHCO-CH {CH ₂ O- (C _k H _2k ) -Rf} -CH ₂ O- ( _{Cl H 2l} ₎ -,
(L7): -SCH ₂ CH ₂ COO-CH {CH ₂ O- (C _j H _2j ) -Rf} -CH ₂ O- (C _k H _2k )-,
(L8): -SCH ₂ CH ₂ COO- (C _j H _2j ) -N (C _k H _{2k + 1} ) SO _2- ,
(L9):-SCH ₂ CH ₂ CON (C _j H _{2j + 1} )-(C _k H _2k )-,
(L10): -SCH ₂ CH ₂ COO- (C _j H _2j ) -N (C _k H _{2k + 1} ) CO-,
(L11): -OCH (CH ₃ ) O- (C _j H _2j )-etc. (Here, j, k, and l each independently represent an integer of 1 to 8, and Rf is the above general formula (where). Any one monovalent fluorinated aliphatic hydrocarbon group represented by Rf-1) to (Rf-3)), but is not limited thereto.
The j, k, and l each independently represent an integer of 2 to 6, and more preferably an integer of 2 to 4.

The gas generating agent of the present invention is represented by at least one of the following (1-1) and (2-1) from the viewpoint of foamability in the ultraviolet region, and has the maximum molar extinction coefficient at a wavelength of 240 to 450 nm. It is preferably a gas generating agent having a value of 7,000 or more and generating a gas by light irradiation.

(In the general formulas (1-1) and (2-1), ^R1 , L, ^Q1 and ^Q2 independently represent the same as the general formulas (1) and (2), respectively. .)

Examples of the compound represented by the general formula (1-1) include, but are not limited to, the following compounds. For example, A is the above (a-1-1) to (a-1-15), L is the above (L1) to (L11), ^Q1 is the above (Rf-1) to (Rf-5), and (Si). Any combination of -3) can be mentioned.

Examples of the compound represented by the general formula (2-1) include, but are not limited to, the following compounds. For example, any of the above (a-1-1) to (a-1-15) as A, the above (L1) to (L11) as L, and the above (Rf-6) and (Si- ² ) as Q2. Combinations can be mentioned.

[Characteristics of gas generator]
The gas generating agent of the present disclosure can efficiently generate a gas by light irradiation because the maximum value of the molar extinction coefficient at a wavelength of 240 to 450 nm is 7,000 or more. From the viewpoint of efficiently generating gas and improving easy peeling property, the gas generator of the present disclosure preferably has a maximum molar extinction coefficient of 8000 or more, preferably 9000 or more, at a wavelength of 240 to 450 nm. Is more preferable.
The molar absorption coefficient of the present specification is 230 nm by dissolving the gas generator in ethyl acetate so as to be 0.1 mM and using an ultraviolet visible spectrophotometer (for example, Shimadzu Corporation, ultraviolet visible spectrophotometer UV2700). The value obtained by measuring the absorption spectrum in the wavelength range of about 800 nm and calculating by the following formula using the absorbance in the obtained absorption spectrum.
ε = A / c × d
(In the formula, ε represents the molar extinction coefficient, A represents the absorbance, c represents the molar concentration, and d represents the cell thickness.)
When the gas generator does not dissolve 0.1 mM in ethyl acetate, a solvent that does not cause a problem in the reproducibility of the molar extinction coefficient of the gas generator is appropriately selected and dissolved in 0.1 mM, and the same as above is obtained. Examples of the solvent that does not cause a problem in the reproducibility of the molar absorption coefficient of the gas generating agent include organic solvents that do not have an absorption spectrum in the wavelength range of 230 nm to 800 nm and do not react with the gas generating agent. Specific examples thereof include acetonitrile, dichloromethane and the like.
In the present specification, the maximum value of the molar extinction coefficient at a wavelength of 240 to 450 nm is 7,000 or more, as long as the value of the molar extinction coefficient at any wavelength between the wavelengths of 240 to 450 nm is 7,000 or more. , The peak may not be present between the wavelengths of 240 and 450 nm.

The molecular weight or mass average molecular weight Mw of the gas generator of the present disclosure is not particularly limited, but is preferably 200 to 2000, preferably 300 to 1000, from the viewpoint of the nitrogen atom content in one molecule. Is more preferable.
Here, the molecular weight of the gas generator can be determined by liquid chromatography-mass spectrometry (LC-MS).
When the gas generating agent contains an organopolysiloxane group, it may be specified by the mass average molecular weight, and the mass average molecular weight can be obtained as a standard polystyrene-equivalent value by gel permeation chromatography (GPC). can.

[Manufacturing method of gas generating agent]
The method for producing the gas generating agent of the present disclosure is not particularly limited, and for example, a gas generating portion having a reactive group, a reactive group that reacts with the reactive group of the gas generating portion to form a bond, and fluorination. The gas generator of the present disclosure can be obtained by reacting and bonding with a compound having an aliphatic hydrocarbon group or an organopolysiloxane group.
Examples of the combination of the reactive groups include a thiol group and a (meth) acryloyloxy group, a thiol group and an epoxy group, a thiol group and a vinyl ether group, a hydroxyl group and a vinyl ether group, a hydroxyl group and an epoxy group, a hydroxyl group and an isocyanate group, and an amino group. , A sulfonyl chloride group, a carboxy group, an epoxy group and the like, but the present invention is not limited thereto. In each combination, which may be the reactive group on the gas generating part side and which may be the reactive group on the compound side having a fluorinated aliphatic hydrocarbon group or an organopolysiloxane group.

Examples of the gas generating part having a reactive group include Russian Journal of General Chemistry (2017), 87 (4), p. It is possible to synthesize by referring to 731-738 and the like. For example, by reacting an isothiocyanate derivative (RN = C = S, where R is an aromatic group having 3 to 20 carbon atoms) with sodium azide, a thiol group and R (which has 3 to 20 carbon atoms) are reacted. A tetrazole compound substituted with an aromatic group) can be synthesized. Further, a naphthoquinone diazide compound having a sulfonic acid chloride group can be synthesized with reference to JP-A-59-196860. Also, with reference to Shandong Huagong, Volume: 37, Issue: 3, Pages: 7-9, Journal, 2008, sodium cyanide, 4-oxopentanoic acid, and hydrazine monohydrate are reacted to form a carboxyl group. Azo-based compounds can be synthesized. Alternatively, a commercially available product may be appropriately selected and used as the gas generating unit having a reactive group.
Further, the compound having a reactive group and a fluorinated aliphatic hydrocarbon group or an organopolysiloxane group is, for example, Patent No. 6137289, ChemistrySelect, Volume: 3, Issue: 15, Pages: 4129-4132, Journal, 2018. By reacting a naphthoquinone diazide compound having a sulfonic acid chloride group with an organopolysiloxane compound having an amino group, a compound having an organopolysiloxane group can be synthesized with reference to. Further, with reference to Macromolecules, Volume: 37, Issue: 18, Pages: 6673-6675, Journal, 2004, by reacting a vinyl ether group having a fluorinated aliphatic hydrocarbon group with an azo compound having a carboxyl group. Compounds having a fluorinated aliphatic hydrocarbon group can be synthesized. Alternatively, as the compound having a reactive group and a fluorinated aliphatic hydrocarbon group or an organopolysiloxane group, a commercially available product may be appropriately selected and used.

[Use of gas generator]
Since the gas generating agent of the present disclosure has the specific fluorinated aliphatic hydrocarbon group or the specific organopolysiloxane group in the gas generating portion having the specific structure, it is easy to be localized on the surface. .. Therefore, as will be described later, the gas generating agent of the present disclosure is applied to an adhesive material for the purpose of high adhesiveness and easy peeling, and is suitably used for improving the easy peeling property.

B. Adhesive Composition The adhesive composition of one embodiment of the present disclosure contains a pressure-sensitive adhesive component and the gas generating agent of the present disclosure.
Since the pressure-sensitive adhesive composition of one embodiment of the present disclosure contains the gas-generating agent of the present disclosure, the amount of gas generated on the surface of the pressure-sensitive adhesive layer due to the action of the gas-generating agent that easily localizes to the surface as described above. Efficiently increases, so that it has good adhesive strength when used when adhesive strength is required, but when the adhesive force that peels off the adhesive layer from the adherend becomes unnecessary, it is removed from the adherend. It is possible to form an adhesive layer having excellent peelability.

[Adhesive component]
The pressure-sensitive adhesive component is not particularly limited, and may be a non-photocurable type pressure-sensitive adhesive component or a photo-curable type pressure-sensitive adhesive component.
When the pressure-sensitive adhesive component is a non-photocurable pressure-sensitive adhesive component, a gas is generated from the gas generating agent of the present disclosure by irradiating with light, and the generated gas generates a peeling stress and is adhered. The area of adhesion to the body decreases and peels off.
When the pressure-sensitive adhesive component is a photocurable pressure-sensitive adhesive component, the area of adhesion to the adherend due to the generation of gas from the gas generating agent of the present disclosure by irradiating with light is reduced, and the pressure-sensitive adhesive is used. Peeling becomes easier due to the synergistic effect of reducing the adhesive strength of the pressure-sensitive adhesive component itself due to the photo-curing of the component. Therefore, the pressure-sensitive adhesive component is preferably a photocurable type.

The photocurable pressure-sensitive adhesive component is not particularly limited, and examples thereof include those containing a photocurable component and a photoinitiator while containing a pressure-sensitive adhesive.
When the photocurable pressure-sensitive adhesive component used in the pressure-sensitive adhesive composition of one embodiment of the present disclosure is a composition containing (i) a pressure-sensitive adhesive, a photo-curable polyfunctional compound, and a photoinitiator. (Ii) A composition containing a pressure-sensitive adhesive having two or more photocurable functional groups in one molecule and a photoinitiator may be mentioned. Among them, the photocurable pressure-sensitive adhesive component is a composition containing (i) a pressure-sensitive adhesive, a photo-curable polyfunctional compound, and a photoinitiator, so that the adhesive strength can be easily adjusted. Is preferable. In the case of (i) above, the pressure-sensitive adhesive may have a photocurable functional group.

(Adhesive)
The adhesive is not particularly limited, and for example, a rubber adhesive, an acrylic adhesive, a vinyl alkyl ether adhesive, a silicone adhesive, a polyester adhesive, a polyamide adhesive, a urethane adhesive, and styrene. -Dienblock copolymerization system Adhesives and the like can be mentioned.

The pressure-sensitive adhesive is preferably a (meth) acrylic acid ester-based polymer, which is called an acrylic pressure-sensitive adhesive, from the viewpoint of compatibility with a photocurable component and adjustment of adhesive strength.
The (meth) acrylic acid ester-based polymer includes a structural unit derived from a (meth) acrylic acid alkyl ester monomer having 1 or more and 20 or less carbon atoms in a linear or branched alkyl group used as an acrylic pressure-sensitive adhesive, and if necessary. It is preferable to use a (meth) acrylic acid ester-based copolymer obtained by copolymerizing with another monomer.
Among the (meth) acrylic acid ester-based polymers, a structural unit derived from a (meth) acrylic acid alkyl ester monomer having a linear or branched alkyl group having 1 or more and 20 or less carbon atoms and a crosslinkable group-containing monomer are derived. It is preferably a (meth) acrylic acid ester-based copolymer having a constituent unit. The (meth) acrylic acid ester-based copolymer can be crosslinked with a heat-crosslinking agent or the like, which will be described later, by utilizing the crosslinkable group introduced into the molecule of the (meth) acrylic acid ester polymer, and is adherent. It is possible to improve the cohesive force of the composition and obtain an adhesive layer having a good balance between easy peeling property and durability under a predetermined environment.

Examples of the (meth) acrylic acid alkyl ester monomer having a linear or branched alkyl group having 1 or more and 20 or less carbon atoms include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and n. -Butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-nonyl ( Meta) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, n-tridecyl (meth) acrylate, n-tetradecyl (meth) acrylate, n- Examples thereof include one type or a combination of two or more types such as hexadecyl (meth) acrylate and n-octadecyl (meth) acrylate. Of these, a linear or (meth) acrylic acid alkyl ester having a branched alkyl group having 4 to 14 carbon atoms is preferable, and a linear chain having 7 to 13 carbon atoms is preferable from the viewpoint of exhibiting wettability and adhesiveness to an adherend. Alternatively, a (meth) acrylic acid alkyl ester having a branched alkyl group is more preferable.

Examples of the crosslinkable group of the crosslinkable group-containing monomer used in the (meth) acrylic acid ester-based polymer include a hydroxyl group, an epoxy group, an isocyanate group, a carboxy group, and an amino group.
From the viewpoint of stability during polymerization and storage of the polymer, it is preferable to include a structural unit derived from a monomer containing at least one selected from the group consisting of a hydroxyl group, an epoxy group, a carboxy group, and an amino group. It is preferable to include a structural unit derived from a hydroxyl group-containing monomer from the viewpoint of high stability and excellent reactivity of the thermal cross-linking agent.

Examples of the monomer for inducing a structural unit derived from the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and glycerin mono (meth) acrylate.
Examples of the monomer for inducing a structural unit derived from the epoxy group-containing monomer include glycidyl (meth) acrylate and 3,4-epoxycyclohexylmethyl (meth) acrylate.
Examples of the monomer for inducing a structural unit derived from the isocyanate group-containing monomer include 2- (meth) acryloyloxyethyl isocyanate and alkylene oxide adducts thereof.
Examples of the monomer for inducing a structural unit derived from an amino group-containing monomer include ethylaminoethyl (meth) acrylate and dimethylaminoethyl (meth) acrylate.
Examples of the monomer for inducing a constituent unit derived from the carboxy group-containing monomer include (meth) acrylic acid, vinyl benzoic acid, maleic acid, ω-carboxy-polycaprolactone mono (meth) acrylate and the like.

Further, the (meth) acrylic acid ester-based polymer may further have a photocurable functional group in the side chain.
As the photocurable functional group, it is preferable to have an ethylenically unsaturated bond, and a (meth) acryloyl group, a vinyl group, an allyl group and the like are preferable.
As a method for introducing a photocurable functional group into the side chain of the (meth) acrylic acid ester-based polymer, a conventionally known production method may be appropriately selected and used.
For example, a glycidyl (meth) acrylate may be reacted with a (meth) acrylic acid ester-based polymer having a carboxy group, or a hydroxyethyl (meth) acrylate may be reacted with a (meth) acrylic acid ester-based polymer having an isocyanate group. A photocurable functional group can be added by reacting a (meth) acrylic acid ester-based polymer having a hydroxyl group with 2-isocyanatoethyl (meth) acrylate.

Further, the (meth) acrylic acid ester-based polymer may contain a structural unit derived from other monomers as long as it functions as an acrylic pressure-sensitive adhesive.
As the other monomer, for example, a rigid monomer such as cyclohexyl methacrylate, benzyl methacrylate, adamantyl methacrylate and the like can be used.

Since the (meth) acrylic acid ester monomer is the main component constituting the (meth) acrylic acid ester-based polymer, the content thereof is usually 50% by mass or more with respect to the total monomer component (100% by mass). Is preferable.
Above all, the content of the (meth) acrylic acid alkyl ester monomer may be, for example, 50% by mass or more, 60% by mass or more, or 80% by mass or more with respect to all the monomer components. , 90% by mass or more. On the other hand, the content of the (meth) acrylic acid alkyl ester monomer is, for example, 99.5% by mass or less, 99% by mass or less, and 98% by mass or less with respect to all the monomer components. You may.

The content of the crosslinkable group-containing monomer may be appropriately selected from the viewpoint of the balance between the adhesive force and the peeling force, but is, for example, 0.5% by mass or more and 1% by mass or more with respect to all the monomer components. It may be present, and may be 2% by mass or more. On the other hand, the content of the crosslinkable group-containing monomer may be, for example, 15% by mass or less, 13% by mass or less, or 10% by mass or less with respect to all the monomer components.

The content of other monomers in the (meth) acrylic acid ester-based polymer may be appropriately selected from the viewpoint of the balance between the adhesive force and the peeling force and the performance to be imparted, and is, for example, 0% by mass or more and 49.5% by mass. % Or less, and may be 39% by mass or less, or 18% by mass or less.

The mass average molecular weight of the (meth) acrylic acid ester-based polymer is preferably 100,000 to 5 million, more preferably 200,000 to 4 million, and even more preferably, from the viewpoint of improving the adhesive force and the peeling force. Is 300,000 to 3 million, and even more preferably 400,000 to 1 million. If the mass average molecular weight is less than 100,000, the cohesive force may be small, and there is a possibility that adhesive residue may be generated on the surface of the adherend after peeling, or the adhesive effect may not be obtained. Further, if the mass average molecular weight exceeds 5 million, the wettability of the surface of the adherend after peeling off the adhesive layer may be insufficient.
The mass average molecular weight of the (meth) acrylic acid ester polymer can be determined by gel permeation chromatography (GPC) as a standard polystyrene-equivalent value.

As the (meth) acrylic acid ester-based polymer, a commercially available acrylic pressure-sensitive adhesive may be used, for example, SK Dyne 2971 (manufactured by Soken Chemical Co., Ltd.), SK Dyne 2975 (manufactured by Soken Chemical Co., Ltd.), SK Dyne 1811L. (Soken Chemical), SK Dyne 2950 (Soken Chemical), SK Dyne 2094 (Soken Chemical), Oliveine EG-654 (Toyochem) and the like can be preferably used.

The pressure-sensitive adhesive can be used alone or in combination of two or more.
The content of the pressure-sensitive adhesive may be, for example, 20% by mass or more, or 30% by mass or more, based on the solid content of the pressure-sensitive adhesive composition, from the viewpoint of the effect of adhesive strength. Further, the content of the pressure-sensitive adhesive may be, for example, 80% by mass or less, or 70% by mass or less, based on the solid content of the pressure-sensitive adhesive composition from the viewpoint of re-peeling of the pressure-sensitive adhesive layer.
In addition, in this specification, a solid content means all components other than a solvent.

(Photocurable polyfunctional compound)
As the photocurable component, it is preferable to contain a photocurable polyfunctional compound. The photocurable polyfunctional compound is a monomer, an oligomer, or a polymer containing two or more photocurable groups in one molecule.
By containing a photocurable polyfunctional compound, it can be three-dimensionally crosslinked, and further, when the (meth) acrylic acid ester-based polymer has photocurability, it is a (meth) acrylic acid ester-based polymer. By reacting with the polymer, the (meth) acrylic acid ester-based polymer can be polymerized or three-dimensionally crosslinked.
By containing the photocurable component, it is possible to easily control the adhesion to the substrate, the cohesiveness, etc. when the adhesive layer is formed within a desired range.

Examples of the photocurable polyfunctional compound include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol di (meth). Acrylate, di (meth) acrylate of neopentyl glycol adipate, neopentyl glycol di (meth) acrylate of hydroxypivalate, dicyclopentanyldi (meth) acrylate, caprolactone-modified dicyclopentenyldi (meth) acrylate, ethylene oxide-modified phosphoric acid Di (meth) acrylate, di (meth) acryloxyethyl isocyanurate, allylated cyclohexyl di (meth) acrylate, tricyclodecanedimethanol di (meth) acrylate, dimethylol dicyclopentane di (meth) acrylate, ethylene oxide modification Hexahydrophthalic acid di (meth) acrylate, neopentyl glycol-modified trimethylol propandi (meth) acrylate, adamantandi (meth) acrylate, 9,9-bis [4- (2-acryloyloxyethoxy) phenyl] fluorene, etc. Bifunctional polyfunctional (meth) acrylate-based monomer, isocyanuric acid ethylene oxide-modified triacrylate, trimethylolpropanetri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid-modified dipentaerythritol tri (meth) acrylate, Trifunctional polyfunctional (meth) acrylate-based monomers such as pentaerythritol tri (meth) acrylate, propylene oxide-modified trimethylol propanetri (meth) acrylate, tris (meth) acryloxyethyl isocyanurate, and diglycerin tetra (meth) acrylate. , A tetrafunctional type such as pentaerythritol tetra (meth) acrylate, for example, a pentafunctional polyfunctional (meth) acrylate-based monomer such as propionic acid-modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, In a hexafunctional polyfunctional (meth) acrylate-based monomer such as caprolactone-modified dipentaerythritol hexa (meth) acrylate, and in molecules called urethane (meth) acrylate, polyester (meth) acrylate, and epoxy (meth) acrylate. Oligos with hundreds to thousands of molecular weights with several (meth) acryloyl groups Mar can be preferably used.

Among the photocurable polyfunctional compounds, there are several (in the molecules called urethane (meth) acrylate, polyester (meth) acrylate, and epoxy (meth) acrylate from the viewpoint of the balance between adhesive force and peeling force. Meta) It is preferable to use an oligomer having an acryloyl group and having a molecular weight of several hundreds to several thousand.

The photocurable polyfunctional compound can be used alone or in combination of two or more.
When the photocurable polyfunctional compound is used, the content of the photocurable polyfunctional compound is, for example, 10 parts by mass or more with respect to 100 parts by mass of the pressure-sensitive adhesive such as the (meth) acrylic acid ester-based polymer. It may be 20 parts by mass or more, 50 parts by mass or more, while it may be 300 parts by mass or less, 200 parts by mass or less, and 150 parts by mass or less. You may.
If the content of the photocurable polyfunctional compound is too small, the addition effect may not be exhibited. On the other hand, if the content of the photocurable polyfunctional compound is too large, the properties such as storage stability, substrate adhesion, tackiness, and peelability of the pressure-sensitive adhesive composition may be significantly deteriorated.

The total content of the pressure-sensitive adhesive and the photocurable polyfunctional compound may be, for example, 10% by mass or more with respect to the solid content of the pressure-sensitive adhesive composition from the viewpoint of the balance of the peeling force after light irradiation. It may be mass% or more. The total content of the pressure-sensitive adhesive and the photocurable polyfunctional compound is, for example, 70% by mass or less with respect to the solid content of the pressure-sensitive adhesive composition from the viewpoint of adhesive strength and suppression of contamination of the adherend. It may be present, and may be 60% by mass or less.

(Light initiator)
As the photoinitiator, any compound that can generate radicals when irradiated with a predetermined amount of light such as ultraviolet rays can be used. For example, benzoine, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin- n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropane-1 -On, 1-Hydroxycyclohexylphenylketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propane-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-) 2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tershary-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone. , 2-Ethylthioxanthone, 2-Chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethylketal, acetophenonedimethylketal, p-dimethylaminobenzoic acid ester, oligo [2-hydroxy-2-methyl -1 [4- (1-methylvinyl) phenyl] propanone], 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide and the like can be mentioned.
Among them, a group consisting of an acylphosphine oxide-based initiator, an α-aminoalkylphenone-based initiator, an α-hydroxyketone-based initiator, and an oxime ester-based initiator in order to cure to the inside of the coating film and improve durability. At least one selected from is preferred.
The photoinitiator can be used alone or in combination of two or more.

The content of the photoinitiator may be, for example, 0.5% by mass or more, and 1.0% by mass or more, based on the solid content of the pressure-sensitive adhesive composition, from the viewpoint of sufficiently curing the pressure-sensitive adhesive composition. You may. Further, the content of the photoinitiator may be, for example, 10.0% by mass or less and 5.0% by mass or less with respect to the solid content of the pressure-sensitive adhesive composition from the viewpoint of the balance between the adhesive force and the peeling force. May be.

(Thermal crosslinker)
The pressure-sensitive adhesive composition of the present disclosure preferably further contains a thermal cross-linking agent. The thermal cross-linking agent refers to a compound that promotes a cross-linking reaction by the action of heat.
By containing a heat-crosslinking agent in the pressure-sensitive adhesive composition of the present disclosure, the pressure-linking agent is reacted with the cross-linking group contained in the pressure-sensitive adhesive to eliminate the fluidity of the pressure-sensitive adhesive composition itself after film formation, or the pressure-sensitive adhesive force before light irradiation. The peeling force can be adjusted.

Examples of the thermal cross-linking agent include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, melamine-based cross-linking agents, aziridine-based cross-linking agents, and metal chelate-based cross-linking agents. Among these, isocyanate-based cross-linking agents and epoxy-based cross-linking agents are preferable because the effects of the present disclosure can be easily exhibited.

Examples of the isocyanate-based cross-linking agent include lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate, alicyclic isocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate and isophorone diisocyanate, and 2,4-tolylene diisocyanate. Aromatic isocyanates such as isocyanate, 4,4'-diphenylmethane diisocyanate, xylylene diisocyanate, trimethylol propane / tolylene diisocyanate trimer adduct (trade name "Coronate L" manufactured by Nippon Polyurethane Industry Co., Ltd.), trimethylol propane / to Examples thereof include isocyanate adducts such as xamethylene diisocyanate trimer adduct (trade name "Coronate HL" manufactured by Nippon Polyurethane Industry Co., Ltd.) and isocyanurates of hexamethylene diisocyanate (trade name "Coronate HX" manufactured by Nippon Polyurethane Industry Co., Ltd.).

Examples of the epoxy-based cross-linking agent include bisphenol A, epichlorohydrin-type epoxy-based resin, ethylene glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6-hexanediol glycidyl ether, and trimethylol. Propanetriglycidyl ether, diglycidylaniline, diamineglycidylamine, N, N, N', N'-tetraglycidyl-m-xylenediamine (trade name "TETRAD-X" manufactured by Mitsubishi Gas Chemicals), 1,3-bis ( N, N-diglycidylaminomethyl) cyclohexane (trade name "TETRAD-C" manufactured by Mitsubishi Gas Chemicals) and the like can be mentioned.

The heat cross-linking agent can be used alone or in combination of two or more.
The content of the heat-crosslinking agent may be appropriately adjusted depending on the balance between the adhesive force and the peeling force, but is, for example, 1.0% by mass or more with respect to the solid content of the adhesive composition from the viewpoint of obtaining the above effects. It may be 2.0% by mass or more. Further, the content of the heat-crosslinking agent may be, for example, 10.0% by mass or less, and 8.0% by mass or less, based on the solid content of the pressure-sensitive adhesive composition from the viewpoint of adhesiveness before energy irradiation. You may.

[Gas generator of the present disclosure]
The pressure-sensitive adhesive composition of the present disclosure contains the gas generating agent of the present disclosure.
Since the gas generating agent of the present disclosure is easily localized on the surface of the pressure-sensitive adhesive material, the amount of gas generated on the surface of the pressure-sensitive adhesive material can be efficiently increased without increasing the content of the gas-generating agent in the pressure-sensitive adhesive composition. Since it can be increased, it is easy to suppress a decrease in the adhesive strength of the adhesive material and white turbidity.

The content of the gas generating agent of the present disclosure may be, for example, 2% by mass or more, and 3% by mass, based on the solid content of the pressure-sensitive adhesive composition, from the viewpoint of effectively reducing the peeling force at the time of peeling. It may be the above. Further, the content of the gas generating agent of the present disclosure may be, for example, 40% by mass or less with respect to the solid content of the pressure-sensitive adhesive composition from the viewpoint of suppressing a decrease in the pressure-sensitive adhesive force and white turbidity of the pressure-sensitive adhesive material. It may be 30% by mass or less.
If the white turbidity of the adhesive material can be suppressed and the transparency is high, for example, precise appearance defects can be confirmed by a camera or the like via the adhesive layer, and the adhesive layer is also suitable for a process-removable adhesive sheet. It can be used for a wide range of purposes.

[solvent]
The pressure-sensitive adhesive composition of the present disclosure may further contain a solvent. By containing the solvent, it is possible to improve the applicability to the base material and the like and the mixability of the compounding components.
The solvent does not react with each component in the composition, and can be appropriately selected and used from the solvents capable of dissolving or dispersing them. Examples of the solvent include esters, aromatic hydrocarbons, ketones and ethers.
More specifically, since it has good solubility in (meth) acrylic acid ester-based polymers and is easy to handle, methyl acetate, ethyl acetate, n-butyl acetate, i-butyl acetate, benzene, etc. Examples thereof include one or a combination of two or more of toluene, xylene, acetone, cyclohexane, cyclohexanone, methylethylketone, tetrahydrofuran and the like.

Further, the content of the solvent may be appropriately adjusted from the viewpoint of applicability to the base material and the like and the mixing property of the compounding components, but with respect to the total amount (100% by mass) of the pressure-sensitive adhesive composition including the solvent. For example, 5% by mass or more and 40% by mass or less can be mentioned.

[Arbitrary additive component]
The pressure-sensitive adhesive composition of the present disclosure may further contain various additives, if necessary, as long as the object of the present disclosure is not impaired.
Examples of various additives include cross-linking accelerators, antioxidants, stabilizers, viscosity modifiers, tackifier resins, organic or inorganic fillers and the like.
Examples of the cross-linking accelerator include those of triethylamine type, cobalt naphthenate type, tin type, zinc type, titanium type and zirconium type. When the cross-linking agent is an isocyanate-based cross-linking agent, zinc-based, titanium-based and zirconium-based accelerators such as alkoxides, acylates and complexes, and stannous chloride, tetra-n-butyltin, stannic chloride and trimethyltin hydroxide are used. , Dimethylditin chloride, di-n-butyltin dilaurate and other tin-based accelerators are preferably used.
Further, examples of the antioxidant include a phenolic antioxidant and the like.

[Manufacturing of adhesive composition]
The method for producing the pressure-sensitive adhesive composition is not particularly limited.
The pressure-sensitive adhesive composition can be obtained by adding, dissolving or dispersing each of the above-mentioned components and various additives added as needed in any order. The mixing of each component can be carried out using, for example, a mixer such as a dissolver, a planetary mixer, a butterfly mixer, or a kneader.

[Use of adhesive composition]
The use of the pressure-sensitive adhesive composition of the present disclosure is not particularly limited, but it can be suitably used for the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet described later, and can be suitably used for the use described for the pressure-sensitive adhesive sheet described later.
In addition, the pressure-sensitive adhesive composition of the present disclosure can be used for a pressure-sensitive adhesive material that is not in the form of a sheet, and can be applied to, for example, a temporary fixing adhesive or the like.

C. Adhesive Sheet The adhesive sheet of one embodiment of the present disclosure comprises an adhesive layer and a base material or a release sheet on one surface of the adhesive layer.
The pressure-sensitive adhesive layer is a pressure-sensitive adhesive composition or a cured product thereof containing the pressure-sensitive adhesive component and the gas generating agent of the present disclosure, and the pressure-sensitive adhesive layer has a property that the pressure-sensitive adhesive force is reduced from the initial adhesive force by light irradiation. , Adhesive sheet.

1 and 2 show schematic cross-sectional views of an example of the pressure-sensitive adhesive sheet of the present disclosure.
The pressure-sensitive adhesive sheet 10 of the present disclosure in FIG. 1 includes a pressure-sensitive adhesive layer 1 and a base material or a release sheet 2 arranged on one surface of the pressure-sensitive adhesive layer 1.
The pressure-sensitive adhesive sheet 10 of the present disclosure in FIG. 2 includes a pressure-sensitive adhesive layer 1, a base material or a mold release sheet 2 arranged on one surface of the pressure-sensitive adhesive layer 1, and the base material or a mold-release sheet 2 of the pressure-sensitive adhesive layer 1. It is provided with a mold release sheet 3 arranged on a surface opposite to the side. In order to facilitate the handling of the adhesive sheet of the present disclosure, the release sheet is placed on the surface of the adhesive layer opposite to the base material or the release sheet 2 side until it is attached to the adherend. You may stick them together.

[Adhesive layer]
The pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet of the present disclosure is a pressure-sensitive adhesive composition containing the pressure-sensitive adhesive component and the gas generating agent of the present disclosure, or a cured product thereof.
The pressure-sensitive adhesive composition containing the pressure-sensitive adhesive component and the gas generating agent of the present disclosure may be the same as the pressure-sensitive adhesive composition of the present disclosure, and thus the description thereof is omitted here.
When the pressure-sensitive adhesive composition contains a curable pressure-sensitive adhesive component, the pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet of the present disclosure may be a cured product of the pressure-sensitive adhesive composition.

The film thickness of the adhesive layer can be adjusted as appropriate according to the purpose. The film thickness of the adhesive layer may be, for example, 100 μm or less, and may be 90 μm or less, or 80 μm or less, from the viewpoint of removability of the adhesive layer. On the other hand, the film thickness of the adhesive layer may be, for example, 10 μm or more, and may be 20 μm or more, or 40 μm or more, from the viewpoint of developing adhesive force.

The adhesive layer has an initial adhesive force before light irradiation, which is 0 for a glass plate (trade name: non-alkali glass OA-11, manufactured by Nippon Electric Glass) at a peeling speed of 300 mm / min and a peeling angle of 180 degrees. It may be 1 N / 25 mm or more, and may be 0.2 N / 25 mm or more. On the other hand, the peeling force at the peeling angle of 180 degrees may be 30 N / 25 mm or less, or 20 N / 25 mm or less.
In addition, the adhesive layer has an adhesive force after light irradiation, which is a peeling force of 300 mm / min for a glass plate (trade name: non-alkali glass OA-11, manufactured by Nippon Electric Glass) at a peeling angle of 180 degrees. It may be 0N / 25mm or more, and may be 0.01N / 25mm or more. On the other hand, the peeling force at the peeling angle of 180 degrees may be 1 N / 25 mm or less, or 0.1 N / 25 mm or less. The light irradiation amount may be appropriately selected, and for example, the adhesive force after irradiation with ultraviolet rays (UV) at an exposure amount of 3000 mJ / cm ² can be used as one index of the adhesive force after light irradiation.
In general, the higher the peeling speed, the higher the peeling force.

The total light transmittance of the adhesive layer is preferably 80% or more, and more preferably 90% or more in the state before light irradiation. Further, the adhesive layer preferably has a haze of 1.5% or less, more preferably 1.0% or less, in a state before light irradiation. Here, the total light transmittance of the present disclosure can be measured according to JIS K7361-1, and can be measured by, for example, a haze meter (for example, HM150 manufactured by Murakami Color Technology Laboratory). Further, the haze value can be measured by a method conforming to JIS K-7136, and can be measured by, for example, a haze meter (for example, HM150 manufactured by Murakami Color Technology Research Institute).
Within such a range, the transparency of the adhesive layer is good, and the adherend can be precisely checked and inspected by a camera or the like with the adhesive sheet attached.

It can be confirmed by collecting and analyzing the material from the adhesive layer that the adhesive layer contains the adhesive component and the gas generating agent of the present disclosure. As the analysis method, LC-MS is preferably mentioned, and in addition, LC fractionation, GPC fractionation, NMR, IR, GC-MS, XPS, TOF-SIMS and a combination method thereof can be applied. can.

[Base material]
The base material used for the pressure-sensitive adhesive sheet of the present disclosure may be appropriately selected and used, and is not particularly limited. Since it is preferable to reduce the adhesive force from the initial adhesive force of the adhesive layer by irradiating light from the substrate side of the adhesive sheet, it is preferable to use a transparent substrate.
The base material used for the pressure-sensitive adhesive sheet of the present disclosure preferably has a total light transmittance of 80% or more, and more preferably 90% or more. Further, the base material used for the pressure-sensitive adhesive sheet of the present disclosure preferably has a haze of 1.5% or less, and more preferably 1.0% or less.

The base material used for the pressure-sensitive adhesive sheet of the present disclosure is preferably one having heat resistance, and for example, in addition to polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polyimide resin, polycarbonate resin, polystyrene resin, and polyamide resin. , Polyetherimide resin, polyetherketone resin, polyphenylene sulfide resin, polyacrylate resin, polyester ether resin, polyamideimide resin, polymethylmethacrylate resin, fluororesin and the like. Polyethylene terephthalate is a particularly preferable base material in terms of economy and performance.

The base material may have a single-layer structure or may have a multi-layer structure.
Further, the base material may be surface-treated on the surface on which the adhesive layer is arranged in order to enhance the adhesion to the adhesive layer.

The film thickness of the base material may be appropriately selected according to the use of the adhesive sheet, and is not particularly limited. The film thickness of the base material may be, for example, a thickness that can be supported with the required strength, and the thickness of what has been conventionally used as a base film, for example, a film thickness of about 10 to 200 μm is preferable. Used.

[Release sheet]
The release sheet is not particularly limited as long as it can be peeled off from the adhesive layer, and can have enough strength to protect the adhesive layer. Examples of such a release sheet include a release film, a release paper, and the like. Further, any known release sheet can be used, and it may have a single-layer structure or a multi-layer structure.

Examples of the release sheet having a single-layer structure include a release PET film, a fluororesin-based film, and the like.
Further, as the release sheet having a multi-layer structure, for example, a laminated body having a release layer on one side or both sides of the base material layer can be mentioned. Examples of the base material layer include resin films such as polypropylene, polyethylene and polyethylene terephthalate, and papers such as high-quality paper, coated paper and impregnated paper. The material of the release layer is not particularly limited as long as it is a material having releasability, and for example, a silicone compound, an organic compound modified silicone compound, a fluorine compound, an aminoalkyd compound, a melamine compound, an acrylic compound, a polyester compound, and a length. Examples thereof include chain alkyl compounds. These compounds can be emulsion type, solvent type or solvent-free type.
The thickness of the release sheet can be, for example, about 15 to 200 μm.

[Manufacturing method of adhesive sheet]
The pressure-sensitive adhesive sheet of the present disclosure can be produced by any suitable method.
The pressure-sensitive adhesive sheet of the present disclosure can be obtained by producing a base material or a laminate of a release sheet and a pressure-sensitive adhesive layer. Such a laminate is, for example,
(1) A method of forming a pressure-sensitive adhesive layer by applying a solution of a pressure-sensitive adhesive composition or a heat-melted liquid onto a base material or a release sheet.
(2) A method of transferring an adhesive layer applied and formed on a release sheet onto a substrate according to the above (1).
(3) A method of extruding an adhesive composition onto a substrate to form and apply it.
(4) A method of extruding a base material layer and an adhesive layer in two or multiple layers,
It can be manufactured by any suitable method, such as.
Above all, the production method of (1) above is preferably used.

Further, the surface of the base material used for the pressure-sensitive adhesive sheet of the present disclosure can be surface-treated if desired. The surface treatment at this time includes, for example, (1) discharge treatment such as corona discharge treatment and glow discharge treatment, (2) plasma treatment, (3) flame treatment, (4) ozone treatment, (5) ultraviolet treatment and electron beam. , Ionizing active ray treatment such as radiation treatment, (6) roughening treatment such as sand mat treatment and hairline treatment, (7) chemical treatment, (8) anchor layer formation and the like. As the anchor layer, a polyurethane resin, a polyester resin, an acrylic resin, a polyester polyurethane resin, or the like is used. The thickness of this anchor layer is usually in the range of 0.01 to 1.5 μm.

As a method for applying the pressure-sensitive adhesive composition to the base material or the release sheet, a known method can be appropriately selected and used. For example, gravure coat method, reverse coat method, knife coat method, dip coat method, spray coat method, air knife coat method, spin coat method, roll coat method, printing method, immersion pulling method, curtain coat method, die coat method, casting. Examples thereof include a coating method such as a method, a bar coating method, an extrusion coating method, an E-type coating method, various printing methods, and a transfer method using a mold or the like.

The pressure-sensitive adhesive composition layer applied on the base material or the release sheet may be formed into a pressure-sensitive adhesive layer by thermally cross-linking the heat-crosslinking agent by removing (drying) the solvent as necessary and heating. can.

The pressure-sensitive adhesive sheet of the present disclosure is provided with a pressure-sensitive adhesive composition containing the pressure-sensitive adhesive component and the gas-generating agent of the present disclosure, or a pressure-sensitive adhesive layer which is a cured product thereof. It is an adhesive sheet that can reduce the peeling force from the adherend at the time of peeling while having a force, and has excellent peelability from the adherend. Further, since the content of the gas generating agent can be reduced, the adhesive layer is less likely to become cloudy and has high transparency.
Since the adhesive sheet of the present disclosure is excellent in easy peeling property from the adherend after use, for example, the adherend itself can be thinned and functioned by refining and complicating various electronic members and optical members. When the adherend itself or the surface of the protected member is easily destroyed due to the integration and miniaturization of It can also be used as a suitable pressure-sensitive adhesive sheet when the force required for peeling is increased.

Due to the above characteristics, the pressure-sensitive adhesive sheet of the present disclosure can be suitably used as a process pressure-sensitive adhesive material for the purpose of high adhesiveness and easy peeling. Temporarily fixed support, temporary fixing support when dicing a thin film wafer to a semiconductor chip, temporary fixing when cutting a crimp-integrated sheet in the manufacturing process of a laminated ceramics capacitor (MLCC) to make a chip Examples thereof include a support for temporary fixing in the manufacturing process of a flexible printed wiring board, a removable adhesive protective sheet for a process that protects the surface of the substrate in the manufacturing process of a flexible printed wiring board and a flexible organic EL display, and the like. ..

Hereinafter, the present disclosure will be specifically described with reference to examples. These statements do not limit the embodiments of the present disclosure.
The chemical structure of each of the produced compounds was confirmed by ¹ H-NMR measurement (device name: AVANCE 400 MHz, manufactured by BRUKER).

(Production Example 1: Production of Compound 1 (gas generating agent))
Reactor equipped with cooling tube, addition funnel, nitrogen inlet, mechanical stirrer, digital thermometer, methyl ethyl ketone (MEK, manufactured by Showa Inc.) 15.61 g, 5-mercapto-1-phenyl-1H tetrazole (manufactured by Tokyo Kasei) ) 2 g (0.0112 mol), 2- (perfluorohexyl) ethyl acrylate (Viscoat 13F, manufactured by Osaka Organic Chemistry) 4.69 g (0.0112 mol), dimethylphenylphosphine 0.1 g (catalyst: 6 mol% with respect to acrylate) Was added, nitrogen bubbling was performed for 10 minutes, the atmosphere was changed to a nitrogen atmosphere, and the mixture was stirred at 80 ° C. for 6 hours.
After 6 hours, the temperature was returned to room temperature, liquid separation was performed with MEK and pure water, MEK was distilled off, and after vacuum drying, 5.95 g (0.010 mol, yield 89%) of Compound 1 represented by the following formula was obtained. rice field. ¹ It was confirmed that the target product could be synthesized by 1 H-NMR (solvent: CDCl ₃ ).
NMR chemical shift ppm (multiplicity, number of protons): 7.50-7.57 (m, 5H), 4.40-4.44 (m, 2H), 3.60-3.64 (m, 2H) , 3.0-3.10 (m, 2H), 2.50-2.60 (m, 2H)

(Production Example 2: Production of Compound 2 (gas generating agent))
In Production Example 1, 3.57 g (0.0112 mol) of 2- (perfluorobutyl) ethyl acrylate (manufactured by Tokyo Kasei) was used instead of 2- (perfluorohexyl) ethyl acrylate. Similarly, 5.4 g (0.0108 mol, yield 97%) of the compound 2 represented by the following formula was obtained. ¹ It was confirmed that the target product could be synthesized by 1 H-NMR (solvent: CDCl ₃ ).
NMR chemical shift ppm (multiplicity, number of protons): 7.50-7.57 (m, 5H), 4.40-4.44 (m, 2H), 3.60-3.64 (m, 2H) , 3.0-3.10 (m, 2H), 2.50-2.60 (m, 2H)

(Production Example 3: Production of Compound 3 (gas generating agent))
(1) Synthesis of compound intermediate 1 (5-mercapto-1-naphthyl-1H tetrazole) of compound 3 A reactor equipped with a cooling tube, an addition funnel, an inlet for Ar, a mechanical stirrer, and a digital thermometer is equipped with acetonitrile (5-mercapto-1-naphthyl-1H tetrazole). Fuji Film Wako Pure Chemical Industries, Ltd. 500g, 1-naphthyl isothiocyanate (manufactured by Tokyo Kasei) 25g (0.135mol), sodium azide (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.) 25g (0.162mol), zinc chloride (Fuji Film Sum) 22.1 g (0.162 mol) (manufactured by Wako Pure Chemical Industries, Ltd.) was added, Ar bubbling was performed for 10 minutes, the atmosphere was adjusted to Ar, and the mixture was stirred at 80 ° C. for 2 hours.
After 2 hours, return to room temperature, concentrate the reaction solution at 35 ° C., add 500 mL of 5 wt% NaOH aqueous solution, stir at room temperature for 30 minutes, remove unnecessary substances by suction filtration, and wash 3 times with chloroform. After removing the organic layer, 40 mL of concentrated hydrochloric acid was added dropwise, stirred at 0 ° C to 10 ° C for 10 minutes, washed and dried using suction filtration and 150 mL of ion-exchanged water, and then suspended and washed by adding 500 mL of acetonitrile again. After concentration, suction filtration and vacuum drying, 13.6 g (0.060 mol, yield 44.2%) of the compound intermediate 1 represented by the following formula was obtained. ¹ It was confirmed by 1 H-NMR (solvent: DMSO-d ₆ ) that the target product could be synthesized.
NMR chemical shift ppm (multiplicity, number of protons): 8.23-8.25 (d, 1H), 8.12-8.15 (d, 1H), 7.59-7.80 (m, 4H) , 7.42-7.45 (d, 1H)

(2) Synthesis of Compound 3 (Gas Generator) Production Example 1 except that 2.55 g (0.0112 mol) of Compound Intermediate 1 was used instead of 5-mercapto-1-phenyl-1H tetrazole. In the same manner as in Example 1, 6.50 g (0.0101 mol, yield 90%) of compound 3 represented by the following formula was obtained. ¹ It was confirmed that the target product could be synthesized by 1 H-NMR (solvent: CDCl ₃ ).
NMR chemical shift ppm (multiplicity, number of protons): 8.07-8.10 (d, 1H), 7.97-8.00 (d, 1H), 7.50-7.60 (m, 5H) 4.40-4.44 (m, 2H), 3.60-3.64 (m, 2H), 3.0-3.10 (m, 2H), 2.50-2.60 (m, 2H)

(Comparative Production Example 1: Production of Comparative Compound 1)
Production Example 1 except that 1.3 g (0.0112 mol) of 5-mercapto-1-methyl-1H tetrazole (manufactured by Tokyo Kasei) was used instead of 5-mercapto-1-phenyl-1H tetrazole. In the same manner as in No. 1, 5.68 g (0.0106 mol, yield 95%) of Comparative Compound 1 represented by the following formula was obtained. ¹ It was confirmed that the target product could be synthesized by 1 H-NMR (solvent: CDCl ₃ ).
NMR chemical shift ppm (multiplicity, number of protons): 4.40-4.44 (m, 2H), 4.00-4.10 (s, 3H), 3.60-3.64 (m, 2H) , 3.0-3.10 (m, 2H), 2.50-2.60 (m, 2H)

(Comparative Production Example 2: Production of Comparative Compound 2)
In Production Example 1, 1.12 g (0.0112 mol) of ethyl acrylate (manufactured by Tokyo Kasei) was used instead of 2- (perfluorohexyl) ethyl acrylate, but the following formula was used in the same manner as in Production Example 1. 2.99 g (0.0108 mol, yield 96%) of Comparative Compound 2 represented was obtained. ¹ It was confirmed that the target product could be synthesized by 1 H-NMR (solvent: CDCl ₃ ).
NMR chemical shift ppm (multiplicity, number of protons): 4.35-4.40 (t, 2H), 3.55-3.60 (t, 2H), 3.0-3.10 (t, 2H) 2.40-2.60 (m, 3H)

In addition, 5-mercapto-1-phenyl-1H tetrazole (manufactured by Tokyo Kasei) was prepared as the comparative compound 3.

[evaluation]
<Mole extinction coefficient>
The molar absorption coefficient is determined by dissolving the obtained compound in ethyl acetate so as to be 0.1 mM, and using an ultraviolet-visible spectrophotometer (UV2700, Shimadzu Corporation's ultraviolet-visible spectrophotometer UV2700) in the wavelength range of 230 nm to 800 nm. The absorption spectrum was measured, and the value obtained by calculation by the following formula was obtained using the absorbance in the obtained absorption spectrum.
ε = A / c × d
(In the formula, ε represents the molar extinction coefficient, A represents the absorbance, c represents the molar concentration, and d represents the cell thickness.)
Table 3 shows the maximum value of the molar extinction coefficient at a wavelength of 240 to 450 nm and the terminal absorption wavelength on the long wavelength side where the absorbance is 0.01.

<Presence / absence of gas generation>
(Meta) acrylic acid ester polymer (trade name: SK Dyne 1811L, manufactured by Soken Kagaku) 100 parts by mass, thermal cross-linking agent (isocyanate-based cross-linking agent, trade name: Coronate L, manufactured by Nippon Polyurethane Industry) 6 parts by mass, compound 39.4 parts by mass of each of 1 to 3 and comparative compounds 1 to 3 and 486.77 parts by mass of a solvent (trade name: trade name: KT-11, manufactured by Showa Ink) are mixed, and a PET substrate (trade name) is mixed. : Lumirer U34 75 μm manufactured by Toray) was coated with an applicator (manufactured by Yoshimitsu Seiki) so that the film thickness after drying was 50 μm. After heating in an oven at 80 ° C. for 3 minutes to obtain an adhesive layer, the adhesive layer side of the adhesive sheet from which the release PET film was peeled off by cutting to a width of 25 mm was placed on the adhesive layer side of the glass plate adherend (trade name: non-alkali glass). OA-11, manufactured by Nippon Electric Glass) is reciprocated once with a 2 kg roller (manufactured by Tester Sangyo), and then left for 3 hours under the conditions of 23 ° C and 60% humidity, and then exposed using an ultra-high pressure mercury lamp. Ultraviolet (UV) irradiation was performed at 3000 mJ / cm ² , and it was observed whether bubbles were generated at the interface with the glass adherend.
(Evaluation criteria for the presence or absence of gas generation)
〇: Gas is generated.
X: No gas is generated.

(Example 1)
(1) Preparation of adhesive composition (meth) Acrylic acid ester polymer (trade name: SK Dyne 1811L, manufactured by Soken Kagaku) 100 parts by mass, photocurable polyfunctional compound (trade name: urethane acrylate U-10PA, new) Nakamura Chemical Co., Ltd.) 50 parts by mass, photoinitiator (trade name: Omnirad 819, IGM Resins B.V.) 1.5 parts by mass, thermal cross-linking agent (isocyanate-based cross-linking agent, trade name: Coronate L, Nippon Polyurethane Industry) (Manufactured by) 6 parts by mass, compound 1 (gas generator) of Production Example 1 by 39.4 parts by mass, solvent (trade name: KT-11, manufactured by Showa Ink) 659.19 parts by mass, respectively, in Example 1 The pressure-sensitive adhesive composition 1 of the above was obtained.

(2) Manufacture of Adhesive Sheet The adhesive composition 1 obtained above was coated on a PET substrate (trade name: Lumirer U34 75 μm manufactured by Toray Industries, Inc.) with an applicator (manufactured by Yoshimitsu Seiki) so that the film thickness after drying was 50 μm. .. After heating in an oven at 80 ° C. for 3 minutes, an adhesive layer was obtained. Then, a release PET film (trade name: E7006, manufactured by Toyobo) was attached to the adhesive layer with a clean roller to manufacture an adhesive sheet 1.

(Examples 2 to 3)
(1) Preparation of Adhesive Composition In Example 1 (1), the compound 1 of Production Example 1 was changed to the compound 2 of Production Example 2 or the compound 3 of Production Example 3, respectively. The pressure-sensitive adhesive composition 2 or 3 was obtained in the same manner as in 1).

(2) Production of Adhesive Sheet Example 2 or Example 1 in the same manner as in (2) of Example 1 except that the adhesive composition 1 was changed to the adhesive composition 2 or 3 in (2) of Example 1. The adhesive sheet 2 or 3 of 3 was obtained.

(Example 4)
(1) Preparation of Adhesive Composition In (1) of Example 1, 39.4 parts by mass of compound 1 (gas generator) of Production Example 1 and 6.6 parts by mass of compound 3 (gas generator) of Production Example 3 The pressure-sensitive adhesive composition 4 was obtained in the same manner as in (1) of Example 1 except that the parts were changed to parts.

(2) Production of Adhesive Sheet The adhesive sheet 4 of Example 4 is the same as (2) of Example 1 except that the adhesive composition 1 is changed to the adhesive composition 4 in (2) of Example 1. Got

(Comparative Example 1)
(1) Preparation of Comparative Adhesive Composition In Example 1 (1), compound 1 of Production Example 1 was changed to Comparative Compound 1 of Comparative Production Example 1 in the same manner as in Example 1 (1). The comparative pressure-sensitive adhesive composition 1 was obtained.

(2) Production of Comparative Adhesive Sheet Comparison of Comparative Example 1 in the same manner as in (2) of Example 1 except that the adhesive composition 1 was changed to the comparative adhesive composition 1 in (2) of Example 1. Adhesive sheet 1 was obtained.

(Comparative Example 2)
(1) Preparation of Comparative Adhesive Composition The same as (1) of Example 1 except that the compound 1 of Production Example 1 was changed to the comparative compound 2 of Comparative Production Example 2 in (1) of Example 1. The comparative pressure-sensitive adhesive composition 2 was obtained.

(2) Production of Comparative Adhesive Sheet Comparison of Comparative Example 2 in the same manner as in (2) of Example 1 except that the adhesive composition 1 was changed to the comparative adhesive composition 2 in (2) of Example 1. Adhesive sheet 2 was obtained.

(Comparative Example 3)
(1) Preparation of Comparative Adhesive Composition In (1) of Example 1, 39.4 parts by mass of compound 1 (gas generator) of Production Example 1 was used, and comparative compound 2 (gas generator) 6 of Comparative Production Example 2 was used. A comparative pressure-sensitive adhesive composition 3 was obtained in the same manner as in (1) of Example 1 except that the composition was changed to 6.6 parts by mass.

(2) Production of Comparative Adhesive Sheet Comparison of Comparative Example 3 in the same manner as in (2) of Example 1 except that the adhesive composition 1 was changed to the comparative adhesive composition 3 in (2) of Example 1. An adhesive sheet 3 was obtained.

(Comparative Example 4)
(1) Preparation of Comparative Adhesive Composition In Example 1 (1), compound 1 of Production Example 1 was changed to comparative compound 3 (5-mercapto-1-phenyl-1H tetrazole (manufactured by Tokyo Kasei)). Obtained a comparative adhesive composition 4 in the same manner as in (1) of Example 1.

(2) Production of Comparative Adhesive Sheet Comparison of Comparative Example 4 in the same manner as in (2) of Example 1 except that the adhesive composition 1 was changed to the comparative adhesive composition 4 in (2) of Example 1. An adhesive sheet 4 was obtained.

(Comparative Example 5)
(1) Preparation of Comparative Adhesive Composition In (1) of Example 1, 39.4 parts by mass of compound 1 (gas generator) of Production Example 1 was added to comparative compound 3 (5-mercapto-1-phenyl-1H tetrazole). ) The comparative adhesive composition 5 was obtained in the same manner as in (1) of Example 1 except that the composition was changed to 6.6 parts by mass.

(2) Production of Comparative Adhesive Sheet Comparison of Comparative Example 5 in the same manner as in (2) of Example 1 except that the adhesive composition 1 was changed to the comparative adhesive composition 5 in (2) of Example 1. An adhesive sheet 5 was obtained.

(Comparative Example 6)
(1) Preparation of Comparative Adhesive Composition Same as (1) of Example 1 except that 39.4 parts by mass of compound 1 (gas generator) of Production Example 1 was not used in (1) of Example 1. A comparative adhesive composition 6 was obtained.

(2) Production of Comparative Adhesive Sheet Comparison of Comparative Example 6 in the same manner as in (2) of Example 1 except that the adhesive composition 1 was changed to the comparative adhesive composition 6 in (2) of Example 1. An adhesive sheet 6 was obtained.

[evaluation]
<Presence / absence of gas generation>
The adhesive layer side of the adhesive sheet that was cut to a width of 25 mm and the release PET film was peeled off was placed on a glass plate adherend (trade name: non-alkali glass OA-11, manufactured by Nippon Electric Glass) with a 2 kg roller (manufactured by Tester Sangyo). ), After sticking it back and forth once, leaving it for 3 hours under the condition of 23 ° C. and humidity of about 60%, and then using an ultra-high pressure mercury lamp, irradiate with ultraviolet rays (UV) at an exposure of 3000 mJ / cm ² and adhere to the glass. It was observed whether bubbles were generated at the interface with the body.
(Evaluation criteria for the presence or absence of gas generation)
〇: Gas is generated.
X: No gas is generated.

<Evaluation of peel strength of adhesive layer>
The adhesive layer side of the adhesive sheet that was cut to a width of 25 mm and the release PET film was peeled off was placed on a glass plate adherend (trade name: non-alkali glass OA-11, manufactured by Nippon Electric Glass) with a 2 kg roller (manufactured by Tester Sangyo). ) Was reciprocated once, and then left for 3 hours under the conditions of 23 ° C. and a humidity of about 60%, and then the peeling force before UV irradiation (initial peeling force) was measured. After that, ultraviolet (UV) irradiation was further performed with an exposure amount of 3000 mJ / cm ² using an ultra-high pressure mercury lamp, and then the peeling force after UV irradiation was measured.
The peeling force was measured by a 180 ° tensile test (moving speed 300 mm / min, peeling angle 180 degrees, moving 50 mm) using Tensilon (RTF-1150-H manufactured by A & D Co., Ltd.).

<Condition of adhesive layer>
The total light transmittance of the adhesive sheet before UV irradiation was measured by a haze meter (HM150 manufactured by Murakami Color Technology Research Institute) in accordance with JIS K7361-1.
(Evaluation criteria for the condition of the adhesive layer)
Transparency: The total light transmittance is 80% or more.
White turbidity: Total light transmittance is less than 80%.

(Summary of results)
In the pressure-sensitive adhesive sheets of Examples 1 to 4 provided with the pressure-sensitive adhesive layer which is a cured product of the pressure-sensitive adhesive composition to which the gas generating agent of the present disclosure was added, the peeling power after light (UV) irradiation was significantly reduced as compared with the comparative example. It was excellent in easy peeling property, did not cause white turbidity, and was excellent in transparency.
As shown in Example 4, the gas generating agent of the present disclosure efficiently generates gas even in a small amount of 4% by mass in the solid content of the adhesive layer, and maintains high adhesive strength before light irradiation. However, it was clarified that the peeling force was greatly reduced after light irradiation.
On the other hand, in Comparative Example 1 using the gas generating agent of Comparative Compound 1, although gas was not generated by light irradiation although it was localized on the surface, the decrease in peeling power after light irradiation was inferior. In Comparative Examples 2 and 3 using the gas generating agent of Comparative Compound 2, when the content of the gas generating agent was 20% by mass in the solid content, gas was generated on the surface of the adhesive layer, but the gas generating agent. When the content of was as small as 4% by mass in the solid content, no gas generation was observed. In Comparative Examples 2 and 3, the peeling force after light irradiation was almost the same as that of Comparative Example 6 in which the gas generating agent was not used.
Further, in Comparative Example 4 using the gas generating agent of Comparative Compound 3 used in the prior art, gas was generated on the surface of the adhesive layer, but the adhesive layer became cloudy and the peeling force after light irradiation. Was inferior. It is considered that UV curing inhibition was caused by the poor compatibility of the gas generating agent of Comparative Compound 3 and the cloudiness of the adhesive layer. In Comparative Example 5 in which the content of the gas generating agent of Comparative Compound 3 was reduced to 4% by mass in the solid content, no gas generation was observed, and the peeling force after light irradiation was higher than that of Comparative Example 6 in which the gas generating agent was not used. It was inferior.

1 Adhesive layer 2 Base material or mold release sheet 3 Release sheet 10 Adhesive sheet

Claims

A gas generator which is represented by at least one of the following general formulas (1) and (2), has a maximum molar extinction coefficient of 7,000 or more at a wavelength of 240 to 450 nm, and generates a gas by light irradiation.

(In the general formulas (1) and (2),
A independently represents a gas generating part represented by the following general formulas (A-1), (A-2) or (A-3).
L each independently represents a direct bond or a divalent linking group.
Q1 has 2 to 8 carbon atoms to which a fluorine atom is directly bonded, may contain an ether bond (—O—) in the carbon chain, and may have a substituent. Represents a fluorinated aliphatic hydrocarbon group or a monovalent organopolysiloxane group.
Q2 has a divalent fluorinated aliphatic hydrocarbon group having 2 to 8 carbon atoms to which a fluorine atom is directly bonded and may contain an ether bond (—O—) in the carbon chain, or a divalent fluorinated aliphatic hydrocarbon group. Represents a divalent organopolysiloxane group. )

(In the general formulas (A-1), (A-2) and (A-3), R 1 is an aromatic group having 3 to 20 carbon atoms which may have a substituent, and R 2 is independent of each other. In addition, a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent and R3 independently have a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent. , Cyan group, -COOR 5 , or -CONR 6 R 7 , R 4 may have a substituent, a hydrocarbon group having 1 to 20 carbon atoms, a cyano group, -COOR 5 , -CONR 6 R 7 , Or the above-LQ 1 , R 5 and R 7 each independently represent a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent, and R 6 is a hydrogen atom or a hydrogen atom or. Represents a hydrocarbon group having 1 to 5 carbon atoms.)
In the general formulas (1) and (2),
Q 1 is any one of the monovalent fluorinated aliphatic hydrocarbon groups represented by the following (Rf-1) to (Rf-5), or the monovalent represented by the following (Si-1). Represents an organopolysiloxane group
Q2 represents a divalent fluorinated aliphatic hydrocarbon group represented by the following (Rf-6) or a divalent organopolysiloxane group represented by the following (Si-2), claim 1. The gas generator according to.

(In the formula (Rf-1), the formula (Rf-2) and the formula (Rf-3), n independently represents an integer of 2 to 8, and in the formula (Rf-4), n'is 4 to 4 to. In (Rf-5), n represents an integer of 1 to 8, n "represents an integer of 0 to 7, m represents an integer of 0 to 7, and n + n" × m represents an integer of 2 to 8. , J 1 represents a hydrogen atom, a fluorine atom, a hydroxyl group, an amino group, a carboxy group, or a (meth) acryloyloxy group, and in (Rf-6), n is an integer of 0 to 8 and n'is an integer of 0 to 4. , M is an integer of 0 to 8, where n + n ”× m is an integer of 2 to 8).

(In the formulas (Si-1) and (Si-2), R 11 independently has a monovalent hydrocarbon group having 1 to 20 carbon atoms, which may have a substituent, a hydrogen atom, a hydroxyl group, and the like. Represents an alkoxy group having 1 to 20 carbon atoms or a group represented by the following general formula (Si-3), and J2 is a monovalent hydrocarbon having 1 to 20 carbon atoms which may have a substituent. It represents a group, a hydrogen atom, a hydroxyl group, an alkoxy group having 1 to 20 carbon atoms, an amino group, a carboxy group, or a (meth) acryloyloxy group. A independently represents a number of 1 to 100.)

(In the formula (Si-3), R 12 has a monovalent hydrocarbon group having 1 to 20 carbon atoms, a hydrogen atom, a hydroxyl group, or 1 to 20 carbon atoms, each of which may independently have a substituent. Represents an alkoxy group of, and b represents a number from 0 to 100.)
In the general formulas (1) and (2),
L can be directly bonded independently, or -SCH 2 CH 2 COO-, -SCH 2 CH (CH 3 ) COO-, -SCH 2 CH (OH) CH 2- , -OCH 2 CH (OH) CH. 2- , -SCH (CH 3 ) O-, -OCH (CH 3 ) O-, -COO-, -CONH-, -COS-, -SO 2 NH-, or -O- and -S- The invention according to claim 1 or 2, wherein one or more selected from the group may be contained, or a hydrocarbon group having 1 to 22 carbon atoms which may be substituted with a hydroxyl group, or a combination thereof. Gas generator.
A pressure-sensitive adhesive composition containing a pressure-sensitive adhesive component and the gas generating agent according to any one of claims 1 to 3.
The pressure-sensitive adhesive composition according to claim 4, which contains a photocurable component and a photoinitiator.
The pressure-sensitive adhesive composition according to claim 4 or 5, which contains a thermal cross-linking agent.
A base material or a mold release sheet is provided on one surface of the adhesive layer and the adhesive layer.
The pressure-sensitive adhesive layer is a pressure-sensitive adhesive composition or a cured product thereof containing a pressure-sensitive adhesive component and the gas generating agent according to any one of claims 1 to 3, and the pressure-sensitive adhesive layer has an initial pressure-sensitive adhesive force when irradiated with light. An adhesive sheet that has the property of reducing adhesive strength.
The adhesive sheet according to claim 7, further comprising a release sheet on the surface of the adhesive layer opposite to the base material or the release sheet side.
The pressure-sensitive adhesive sheet according to claim 7 or 8, wherein the pressure-sensitive adhesive composition contains a photocurable component and a photoinitiator.
The pressure-sensitive adhesive sheet according to any one of claims 7 to 9, wherein the pressure-sensitive adhesive composition contains a heat-crosslinking agent.